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28 THE TECHNICAL PROCEDURES IN FILLING TEETH.

This gives twelve hatcliets and twelve hoes in the set, which,
with the Specials, is an ample assortment for any practitioner.
The UNIVERSITY SET, Figures 22, 23. In this set all in the
angle 18 centigrades are also stricken out from the long set,
reducing the number to nine hatchets and nine hoes, eighteen
instruments. In this set the side instruments are reduced to
four, and the angles 6 and 23 centigrades of spoons are omitted,
giving a total of fortj^-eight cutting instruments. This is found
ample for the school or the office. This set of cutting instru-
ments has been in actual use in schools for ten years and many
are using it in general practice, so that it has had an abundant
trial. Of course, any one who has learned the formula plan
can add other instruments of the general set at any time with-
out confusion whenever he finds it desirable in his practice, but
for school work it seems unnecessary. This set only will be
used in this book.
The short set, Figure 24, consisting of twenty-five instru-
ments, is probably as good as can be made with that number.
It is a very effective set for school work. It is the shortest set
of cutting instruments that should ever be required of students.
Occasionally there will be some difficulty in deep cavities for
the want of longer blades. In general the work can be well done,
but not quite so conveniently.
It will be noticed in forming the long set from the general
set of 102 instruments, Figures 19, 20, 21, that the ranges of
sizes of blades 14-6, 10-6 and 4-1, are all discarded from the
Ordinaries, both in hatchets and hoes ; reducing the number of
sizes of blades one-half but retaining blades in all of the angles.
This forms a very complete and orderly set of instruments for
the dentist's instrument case. In the next reduction of the
number for the formation of the University set, Figures 22. 23,
all of the angles 18 centigrades are dropped out. This is done
as a result of the observation that dentists generally will choose
the angle 18 centigrades less often than the others. Also that
wliere this angle would be used it can easily be supplied by the
angle of 1 2 centigrades or by the angle 23.
In the further reduction to form the short set, a further
coiiiin'omise is made by selecting the sizes of blade 10-4 and 6-2
only. It forms a usable set for most operations, but to reduce
tlic nnml)er of angles in any of these sizes would be inadmissible.
Other sets may be formed besides those given, but in any
selection made on this plan, the even running of the ranges of
formulas should be carefully preserved. In no case should instru-